I have an equation I have been given to solve, I know how to start but I do not know what to do after I use the Trig Identities. Any help?

Here is what I was given
$$
\frac{\cos(A + B) + \cos(A - B)}{\sin A \sin B}
$$
I got to this step
$$
\frac{\cos A\cos B-\sin A\sin B + \cos A\cos B+\sin A\sin B}{\sin A\sin B}
$$
What do I do next to simplify?